package easy.合并两个有序链表;

public class Solution {
    public ListNode mergeTwoLists(ListNode list1, ListNode list2) {
        if (list1 == null) {
            return list2;
        } else if (list2 == null) {
            return list1;
        } else if (list1.val < list2.val) {
            list1.next = mergeTwoLists(list1.next, list2);
            return list1;
        } else {
            list2.next = mergeTwoLists(list1, list2.next);
            return list2;
        }
    }

    public static void main(String[] args) {
        ListNode head = new ListNode(1, new ListNode(2, new ListNode(4)));
        ListNode head2 = new ListNode(1, new ListNode(3, new ListNode(4)));
        Solution solution = new Solution();
        System.out.println(solution.mergeTwoLists(head, head2));
    }
}
